Read the passage and fill in the blanks with proper words （在短文的空格内填入适当的词，使其内容通顺，每空格限填一词，首字母已给）：（7%）
The first time I went to Grand Canyon National Park（大峡谷国家公园），I knew I wanted to work there as a park ranger （公园护林员）．Park rangers protect the parks'animals，plants，land，buildings，and people．
Now，as a park ranger for Grand Canyon National Park，I share the science，history and beauty of this park with thousands of visitors from around the world．
National parks are l（65） outdoor museums．Park rangers have all kinds of jobs，depending on where they work and what they studied during college．I teach school field trips（学校实地考察），work at visitor centres and help people stay s（66） during their visit．
My favourite part of my job is showing children their first look at the Grand Canyon d（67） school field trips．Children are often amazed at the canyon's size and colours．Sometimes，they think it looks like a painting．
Being a park ranger requires a lot of e（68） ．I walk several miles and talk with hundreds of people each day．Nearly 5million people visit Grand Canyon National Park every year．Park rangers must enjoy working with people and s（69） in front of groups．Park rangers must a（70） be prepared for any situation．Recently，I broke up a traffic jam （堵塞） caused by a huge elk （麋鹿） standing in the road．Elk can become dangerous when they get scared，so I asked visitors to stop their cars and take pictures from far away．Believe it or not，I also help protect people from squirrels（松鼠）．It is not allowed to f（71） wild animals in national parks．But sometimes，visitors still try to feed squirrels．